Fix multi-month scrape coverage and add duo MUSIC EXCHANGE

- Extend 8 scrapers (liquid-room, shibuya-o, club-quattro, meets-otsuka,
  nishieifuku-jam, fever-shindaita, fad-yokohama, and new duo-music-exchange)
  to fetch 3 calendar months instead of 1-2, covering the full 65-day window
- Add duo MUSIC EXCHANGE scraper (渋谷, ~700 cap, /schedule/YYYY/index_YYYY-MM.html)
- Add npm test: Node.js built-in test runner verifies each scraper fetches
  all required month URLs via mocked fetch (10 tests, no extra deps)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/app/scrapers/index.ts b/app/scrapers/index.ts
index c38816f..e812626 100644
--- a/app/scrapers/index.ts
+++ b/app/scrapers/index.ts
@@ -20,6 +20,7 @@ import { scraper as warpKichijoji } from "./warp-kichijoji";
 import { scraper as pitbarNishiogikubo } from "./pitbar-nishiogikubo";
 import { scraper as naveyFloor } from "./navey-floor";
 import { scraper as shimokitazawaEra } from "./shimokitazawa-era";
+import { scraper as duoMusicExchange } from "./duo-music-exchange";
 
 export const ALL_SCRAPERS: Scraper[] = [
   liquidRoom,
@@ -39,6 +40,7 @@ export const ALL_SCRAPERS: Scraper[] = [
   pitbarNishiogikubo,
   naveyFloor,
   shimokitazawaEra,
+  duoMusicExchange,
 ];
 
 export type { Scraper } from "./base";